JPH08141338A - Filter with high cleaning efficiency and regeneration of said filter - Google Patents

Abstract

PURPOSE: To provide a filter capable of removing fats and oils sticking to the surface of the filter easily and a method for the cleaning and regeneration of the filter. CONSTITUTION: A coat 3 is formed on the surface of each baffle board 2 which forms a filter 1. This coat is made of a material which dissolves by water or a specific treatment liquid, or peels off the surface of the filter. A foreign matter 4 sticks to and accumulates on the surface of the filter (directly on the surface of the coat 3) over time due to the use of the filter 1. If this foreign matter 4 accumulates to a specified degree, the filter 1 is removed from a dust collector, and is cleaned using water or the treatment liquid so that the coat 3 on the surface of the filter is dissolved or stripped off. The foreign matter sticking to the surface of the coat 3 is automatically removed by the dissolution or separation of the coat 3. Thus the quantity of water and a detergent and cleaning time required for cleaning are significantly reduced compared to those required when a conventional-type filter is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter used in a dust collector for removing oil mist and oil vapor from a gas stream containing dust or fine oil particles (oil mist) and oil vapor. The present invention relates to a filter configured to effectively remove the deposited matter and a method of regenerating the filter.

[0002]

2. Description of the Related Art For example, in a kitchen of a hotel or a restaurant, a large amount of oil is formed into fine particles (mist) or vapor during the cooking process. Discharging such oil mist or oil vapor, or gas containing steam in some cases (hereinafter referred to as "oil-containing gas") to the outside as it is is one of the causes of air pollution, and oil adhering to the exhaust duct. There is also a risk of fire causing a fire. For this reason, it is necessary to remove the oil content contained in the oil-containing gas before it is discharged to the outside, and various devices have been proposed and are currently used for removing the oil content.

As this type of conventional oil removing apparatus, for example, a filter is used to filter and adsorb the oil content of the oil-containing gas, or a baffle plate or a perforated plate is used to drastically change the flow path of the oil-containing gas. Alternatively, the oil-containing gas is used to collect dust by inertia by colliding with the wall surface. In such a device, in the case of a device used in a general household, these filters and the like may be thrown away, but in a large-scale device for business, these filters are regularly replaced, and the replaced filter Many are configured so that they can be reused after the oil and the like that have adhered are removed by washing. In this case, it is more efficient to wash the replaced filters collectively at a specific treatment site rather than individually cleaning each dust collector installation location. Cleaning and regeneration of filters by the collective centralized method tends to be popular.

[0004]

In the conventional cleaning and regeneration of this kind of filter, the collected filter is collected in a facility for regenerating the filter (hereinafter referred to as "regeneration factory") and attached substances In particular, in the case of a filter recovered from the kitchen, etc., since it is tar-like and adheres with high viscosity in a state where oil and dust are kneaded, it is necessary to remove it. It requires a lot of energy. Specifically, hot water with a cleaning agent (for example, an alkaline cleaning agent) is sprayed onto the target filter, or vibration is applied to chemically remove the deposits and at the same time to physically remove them. Although they are removed, a large amount of hot water and a cleaning agent are required before the removal, which is economically burdensome, and a large-scale treatment facility is additionally required to treat a large amount of waste liquid generated.

[0005]

SUMMARY OF THE INVENTION The present invention is constructed in view of the above-mentioned problems, and is great for removing adhered matters such as dust adhering to a replaceable filter provided in a dust collector, especially for conventional removal. The present invention relates to a filter configured to effectively remove oil-based deposits that require energy and a method for regenerating the filter. In the filter, the fluid passage surface of the filter is treated with water or a specific treatment liquid. A method of regenerating a filter, in which a used filter having a film that dissolves or peels off and is collected is configured such that water or a specific treatment liquid removes the film formed on the surface of the filter and deposits attached to the film. .

[0006]

With respect to the filter which has not been used or has been removed of deposits, a film is formed on the filter surface by a method such as spraying or dipping, and the filter having the film is attached to each dust collector. . Deposits such as oils and fats are deposited and deposited on the mounted filter over time, and these deposits are directly deposited on the coating film on the filter surface. The filter removed from the dust collector after a certain period of time is transported to a processing plant, and the film formed on the surface of the filter is removed by a method such as cleaning. Since the deposit adheres to this coating, the removal of the coating means the removal of the deposit, that is, the regeneration of the filter.Therefore, in the regeneration of the filter, the amount of water or cleaning agent used is much larger than in the conventional case. Less.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings.

First, FIG. 1 (A) shows an example of a state in which a film is formed on a filter. An arrow 1 indicates an example of a filter, and the illustrated filter indicates an inertial dust collecting type filter in which a large number of baffle plates 2 are arranged in a fluid as a dust collecting target. In the following description, this fluid is a fluid containing oil particles or oil mist generated from a kitchen or the like (“oil-containing gas”).
Will be referred to below) as an example.

Each baffle 2 is made of a material such as metal or ceramics, but any kind of material can be used as long as it can withstand the cleaning step described later. A coating 3 is formed in advance on the surface of the baffle plate 2, and the entire surface of the baffle plate 2 is covered with the coating 3.

The film is formed of a material that can be relatively easily peeled off or dissolved by water or a specific processing liquid in a filter regenerating process as described later. For example, the following resins are suitable as the film forming material satisfying such conditions.

(1) [Acrylic Resin] Acrylic ester, methacrylic acid ester, acrylic acid, methacrylic acid, itaconic acid, acrylonitrile, styrene, etc. which are emulsion-copolymerized and contain phosphoric acid ester.

Since the above resin contains a hydrophilic substance (emulsifier, hydrophilic protective colloid, thickener) and the like, it is relatively easily dissolved in water.

(2) [Urethane Resin] A mixture of an isocyanate group-terminated prepolymer (polypropylene glycol, dicyclohexylmethane diisocyanate) and an amine curing agent system (dicyclohexylmethanediamine, isopropyl alcohol, titanium white).

The urethane resin is superior in peelability to the acrylic resin.

(3) [Two-Part Latex Paint] This is a resin (paint) developed relatively recently, and the particles constituting each of the two parts have opposite charges. Further, a small amount of a debinding agent (glycerin) for removing the film is added to each of the resins. As the fusing agent, a strong acid, a metal ion, a water-soluble organic solvent, a polymer-soluble organic solvent, a cationic surfactant or the like is used. For example, the liquid A in the two liquids is composed of a cationic neoprene latex and glycerin, and the liquid B is composed of an anionic latex of polyvinyl chloride and glycerin.

It is also possible to add a catalyst for generating phosphoric acid having a high phosphorus content and a nonflammable gas generating agent (foaming agent) to the above resin so as to cope with an accidental ignition in a duct. . More specifically, as the nonflammable gas generating agent, for example, diciazinamide, melamine, paraffin chloride, etc. are added. With this structure, when a flame comes into contact with the coating 3, phosphoric acid is generated by the thermal decomposition action of the catalyst to exhibit fire resistance, and at the same time, the foaming agent causes the coating 3 to spread.
Foams. In this case, in the illustrated filter 1, if the arrangement interval of the baffle plates 2 is appropriately set in consideration of the increase in the volume of the coating film 3 due to foaming, in addition to the collection of the object, in the event of a fire. The foaming of the coating 3 seals the entire filter 1 and can prevent the flame from leaking to at least the kitchen. In addition, if a special panel for sealing is placed at the outlet of the duct, a closed space will be created inside the duct, and it is expected that a fire will be extinguished naturally due to lack of oxygen.

The coating film 3 made of the resin as exemplified above is formed on the surface of the filter 1 by a method such as spraying or immersing the filter in a solution. Since the filter 1 is arranged with respect to the flow of the oil-containing gas G as shown in the drawing, the oil content in the gas is mainly collected by inertia due to collision or a sudden change in the direction of the air flow, and flows down to an oil reservoir (not shown). Then removed. A part of such oil content adheres to and accumulates as dust 4 on the surface of the coating film 3 along with the dust in the room [see FIG. 1 (B)]. As described above, the deposit 4 has high viscosity and is firmly attached to the surface of the coating film 3. After a certain period of time has passed since the filter was attached, the filter 1 is removed from the dust collector and replaced with a new filter, and the removed filter is transported to a processing plant for regeneration treatment.

FIG. 2 shows a first embodiment which is a basic method of filter regeneration processing.

The filter 1 having the above-mentioned structure removed from the dust collector 5 is collected and collected in the processing factory 6 to be regenerated. First, a plurality of collected filters 1 are sent to a cleaning step S1, where they are cleaned with warm water containing a cleaning agent, for example. In this case, since the coating 3 of the filter 1 is water-soluble, for example, when the coating 3 is immersed in the treated water for a certain period of time, the coating 3 is dissolved or swelled by water to be eluted or peeled from the filter surface. Since all the deposits 4 are attached to the surface of the coating 3, the coating 3 is attached to the filter 1
As a result, the deposits are also removed by being removed from the surface. For this reason, it is possible to remove the deposits in an extremely short time and with a small amount of water, as compared with the conventional cleaning in which the deposits directly attached to the filter surface are removed. In this way, many coatings are automatically removed simply by immersing the filter 1 in the treated water. Subsequently, the remaining film is removed by, for example, spraying treated water on the filter, and the cleaning is completed.

Next, in the filter 1 which has been washed and whose water has been removed, the film 3 is again formed on the filter surface in the film regeneration step S2. The coating 3 is formed by, for example, spraying, coating or immersing the resin in any one of the above (1) to (3) in a molten resin tank. The filter 1 in which the coating film 3 has been regenerated is passed to the drying step S3, and the formed coating film is dried. In addition, in the case of a part of the resin, particularly in the case of a resin that is an emulsion, it is possible to keep the coating surface in a wet state having a certain degree of viscosity even after drying. The viscosity can be expected to improve the collection efficiency.

The regenerated filter is mounted on the predetermined dust collecting device 5 again. Usually, as a filter replacement, the removal of the used filter and the mounting of the regenerated filter which has already been regenerated are carried out at the same time. Perform the operation and restart the operation of the dust collector immediately after the work is completed.

FIG. 3 shows a second modified example of the first embodiment.
An example of is shown.

As described above, in the case of the used filter to be treated, it has been shown that the filter can be efficiently treated and the water for treatment can be saved by immersing the filter in the treated water for a certain period of time. At least a part of the immersion of the treated water is performed during the filter recovery. Normally, in collecting the filters, the system is such that the filters are sequentially collected by going around a plurality of business establishments scheduled to be collected, and then the filters collected from the respective business establishments are collectively carried to the processing factory 6. Therefore, it takes a certain amount of time to collect the filter, and the purpose of this embodiment is to effectively utilize this time.

That is, each filter collected at the time of filter recovery is stored in a container filled with treated water or simple water, and the filters are immersed in the treated water for the time required for the recovery. The process S4 is performed to shorten the processing time in the processing factory 6.

FIG. 4 shows an example of this pretreatment container.
Inside the container 7, a basket-shaped inner container 8 in which a separation plate 8a is formed so as to house a large number of filters at regular intervals,
The collected filters 1 are sequentially arranged and stored at equal intervals along the separation plate 8a. The filter may be stored by transporting the container 7 to a place where a dust collecting apparatus such as a kitchen is installed. Alternatively, the container 7 may be stored in the vehicle and the collected filter 1 may be brought into the vehicle and stored therein. When the container 7 is left in the vehicle, the container 7 may be filled with treated water in advance.

On the other hand, when the number of collected filters is large, the container 7 may be carried to the dust collector installation position and the filters may be housed therein. Further, it is natural that the inner container 8 is divided into several parts, only the inner container is taken out to house the filter, and after the filter is housed, the inner container 8 is housed in the car-mounted container 7 sequentially. It is feasible. In any case, when the container 7 is transported to the filter removal place, immediately after the filter is stored, water is poured into the container (at the filter removal place, a water supply facility such as a kitchen is naturally installed). Alternatively, in order to prevent the weight of the container 7 from increasing, the container is carried into the vehicle and then water or treated water is injected from the vehicle-mounted tank.

Since the treated water or the like is injected into the filter 1 housed in the container 7 as described above, a part or most of the coating 3 on the surface of each filter is dissolved or transported during transportation by the treated water or the like. Peel off. In this case, the vibration during the transportation of the vehicle or the oscillation of the treated water inside due to the stop of the start of the vehicle exerts an agitating effect, which gives a good result in removing the coating film 3. When the filter 1 which has been subjected to the pretreatment S4 during transportation arrives at the processing factory 6 in this manner, the internal container 8 is taken out from each container 7 and is sent to the cleaning step together with the internal container 8 to obtain the above-described first embodiment. The filter is washed and the film is re-formed in the same manner as in. In this embodiment, part or most of the film removing step is completed as a pretreatment during transportation, so that less water or cleaning agent is used in the cleaning step S1 in the factory, and the time until the completion of processing is also reduced. It can be shortened.

FIG. 5 shows a third embodiment. In this embodiment, the regeneration treatment in the treatment plant is performed more efficiently, and the waste oil discharged in the treatment process is efficiently used. First, the filter 1 is washed in the washing step S1, whereby the components forming the coating film 3 and the oils and fats attached to the coating film are eluted into the treated water. This treated water is discharged as a waste liquid WS after the washing treatment, and the waste liquid is separated in the separation step S5 to remove fats and oils, and the detoxified separated water WS 'is discharged to the outside of the system. On the other hand, the separated oil OL separated from the waste liquid WS is incinerated S6,
Moreover, by removing nitrogen oxides, sulfur oxides, and the like in the exhaust gas generated by combustion, the exhaust gas is subjected to exhaust gas treatment S7 and then released into the atmosphere. In this case, since the separated oil OL has a relatively high amount of heat, the heat generated by incineration is used as the heat source H in the filter regeneration processing system. For example, the hot air A1 generated by exchanging the heat source H with the air A for heat exchange HX1 is used as the heat source for drying in the drying step S3.

On the other hand, in another system, the hot water HW generated by the heat exchange HX2 with the water W is used as the hot water for washing in the washing step S1. In this embodiment, waste oil generated in the filter treatment process is incinerated to be discharged and the waste oil can be discharged to the outside of the system, and the heat generated by the incineration can be effectively used in the system. This enables efficient filter regeneration processing.

FIG. 6 shows a fourth embodiment.

This embodiment is a particularly effective method when the coating 3 has a property of peeling off rather than being dissolved in water. First, the recovered filter 1 has the first cleaning step S1a.
The cold water CW is supplied and the film separation energy E such as vibration or water jet is applied to the filter immersed in the cold water CW. In addition, as the vibration energy in the same energy, for example, a method of mechanically vibrating the inner container 8 accommodating the filter 1 or vibrating with an ultrasonic wave is performed. In this way, most of the coating film 3 of the filter 1 is separated and separated S8 in the first cleaning step. Since cold water is used in this separation step, oils and fats directly attached to the film 3 are hardly eluted in water. Therefore, most of the oil and fat is removed from the filter while being attached to the separation film. Therefore, most of the separated oil adheres to the separation coating C removed from the waste liquid as it is, and therefore most of the adhered oil is treated by incinerating the separation coating C in the incineration step S6. Therefore, the oil content in the waste liquid generated in the film separation step S8 is small, and the subsequent treatment is easy. Further, the filter from which most of the coating has been peeled off is subjected to a cleaning treatment in the same manner as in the above-mentioned embodiment in the second cleaning step S1b which is the cleaning step in the above-mentioned embodiment.

Although the filter of the present invention has been described by taking the inertial dust collecting type filter having the baffle plate as an example, it is naturally applicable to a filter dust collecting type filter. Further, it goes without saying that the filter deposit is not limited to oil.

[0033]

As described above in detail with reference to the above embodiments, the filter surface has a coating film which dissolves or peels off with water or a specific treatment liquid. As described above, even if the adhered substance has a high viscosity and is strongly adhered to the filter, it can be easily removed from the filter by dissolving or peeling the coating film, so that the filter can be cleaned and regenerated efficiently and economically. It becomes possible.

Further, by burning the waste oil discharged from the washing step, it is possible to cover a part or the whole of the amount of heat used in the step, which also makes it possible to obtain higher economical efficiency.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a filter according to the present invention, in which (A) shows a new filter immediately after regeneration processing,
(B) shows each filter in the state where the adhered matter was adhered and accumulated.

FIG. 2 is a filter cleaning process step diagram showing the first embodiment of the filter cleaning / regenerating method according to the present invention.

FIG. 3 is a filter cleaning process step diagram showing the second embodiment of the filter cleaning / regenerating method according to the present invention.

FIG. 4 is a perspective view of a filter-carrying container used in the method shown in FIG.

FIG. 5 is a filter cleaning process step diagram showing the third embodiment of the filter cleaning / regenerating method according to the present invention.

FIG. 6 is a filter cleaning process step diagram showing the fourth embodiment of the filter cleaning / regenerating method according to the present invention.

[Explanation of symbols]

 1 Filter 2 Baffle Plate 3 Coating 4 Adhesion 5 Dust Collector 7 Filter Storage Container 8 Inner Container G Oil-Containing Gas

Claims (4)

[Claims] 1. A filter which is disposed in a fluid containing a target to be captured and which traps the target to be captured in the fluid by inertia or filtration, wherein water or a specific treatment is applied to a fluid passage surface of the filter. A filter having an improved efficiency of removing adhered substances, which is characterized in that a film that is melted or peeled off by a liquid is formed. 2. The filter having deposits deposited on the surface of the coating film is collected, and the collection filter is washed with water or a treatment liquid to remove the coating film. A method of regenerating a filter having an improved efficiency of removing deposits, characterized in that a film is formed and regenerated. 3. The recovery filter is housed in a transport container, and the transport container is filled with water or a treatment liquid, so that the container filled with the filter is transported to a treatment plant. 3. The filter in the container is configured to be pretreated for cleaning.
A method for regenerating a filter having an improved efficiency of removing the deposits described above. 4. The separated oil generated from the washing process is incinerated, and the heat generated by the treatment is used as at least a part of a heat source of at least one of hot water for the washing process and hot air for the film drying process. The method for regenerating a filter according to claim 2 or 3, wherein the efficiency of removing deposits is increased.